<template>
    <div>
        <!-- 面包屑导航-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片布局区域-->
        <el-card>
            <!-- 警告区域-->
            <el-alert show-icon :closable="false" title="注意：只允许为第三级分类设置相关参数！" type="warning"></el-alert>
            <!-- 选择商品区域-->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!-- 选择商品分类的级联选择框-->
                    <el-cascader
                            expand-trigger="hover"
                            :options="cateList"
                            :props="cateProps"
                            size="mini"
                            v-model="selectedCateKeys"
                            @change="handleChange"></el-cascader>

                </el-col>
            </el-row>
            <!--tabs标签页区域-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板-->
                <el-tab-pane label="动态参数" name="many">
                    <el-button @click="addDialogVisible=true" :disabled="isBtnDisabled" type="primary" size="mini">添加参数</el-button>
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!--循环渲染tag标签-->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                                <!--输入的文本框-->
                                <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <!--添加的按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParamsClick(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!--添加静态属性的面板-->
                <el-tab-pane label="静态属性" name="only">
                    <el-button @click="addDialogVisible=true" :disabled="isBtnDisabled" type="primary" size="mini">添加属性</el-button>
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!--循环渲染tag标签-->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                                <!--输入的文本框-->
                                <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <!--添加的按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParamsClick(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>

        </el-card>

        <!--添加参数的对话框-->
        <el-dialog @close="addDialogClosed" :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%">
            <!-- 添加参数的表单-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParamsClick">确 定</el-button>
            </span>
        </el-dialog>
        <!--修改参数对话框-->
        <el-dialog @close="editDialogClosed" :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%">
            <!-- 添加参数的表单-->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParamsClick">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data(){
            return{
                //商品分类的数据
                cateList:[],
                //级联选择框的配置对象
                cateProps:{
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                //级联选择框双向绑定的数组
                selectedCateKeys:[],
                //被激活的页签的名称
                activeName:'many',
                //动态属性的数据
                manyTableData:[],
                //静态属性的数据
                onlyTableData:[],
                //控制添加对话框的显示与隐藏
                addDialogVisible:false,
                //添加参数的表单数据对象
                addForm:{},
                //添加参数的表单验证规则对象
                addFormRules: {
                    attr_name:[
                        {required:true,message:"请输入参数名称",trigger:'blur'}
                    ]
                },
                //修改参数对话框的显示与隐藏
                editDialogVisible:false,
                //修改参数的表单对象
                editForm:{},
                //修改参数的表单验证规则对象
                editFormRules:{
                    attr_name:[
                        {required:true,message:"请输入参数名称",trigger:'blur'}
                    ]
                },
                // //控制按钮和文本框的切换
                // inputVisible:false,
                // //文本框中输入的内容
                // inputValue:''

            }
        },
        created() {
            this.getCateList();
        },
        methods:{
            //获得所有商品的分类列表
            async getCateList(){
                const {data:res}=await this.$http.get('categories');
                if(res.meta.status!==200){
                    return this.$message.error('获取商品列表数据失败！');
                }
                this.cateList=res.data
                // console.log(this.cateList)
            },
            //级联选择框改变时会触发的函数
            handleChange(){
                this.getParamsData();
            },
            //tabs页签点击事件处理函数
            handleTabClick(){
                // console.log(this.activeName)
                this.getParamsData();
            },
            async getParamsData(){
                if(this.selectedCateKeys.length!==3){
                    //证明选中的不是三级分类
                    this.selectedCateKeys=[];
                    this.manyTableData=[];
                    this.onlyTableData=[]
                    return;
                }
                // console.log(this.selectedCateKeys)
                //根据所选的id和当前所处的面板，获取对应的参数
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}});
                if(res.meta.status!==200){
                    return this.$message.error('获取参数列表失败！');
                }
                console.log(res.data)

                res.data.forEach(item=>{
                    item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[];
                    //控制文本框的显示与隐藏
                    item.inputVisible=false;
                    //文本框中输入的值
                    item.inputValue=''

                })

                if(this.activeName==='many'){
                    this.manyTableData=res.data;
                }else{
                    this.onlyTableData=res.data;
                }

            },
            //监听添加对话框的关闭时间
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            //点击按钮添加参数
            addParamsClick(){
                this.$refs.addFormRef.validate(async valid=>{
                    if(!valid) return
                    const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name, attr_sel:this.activeName});
                    if(res.meta.status!==201){
                        return this.$message.error('添加参数失败!');
                    }
                    this.$message.success('添加参数成功!')
                    this.addDialogVisible=false
                    this.getParamsData()
                })

            },
            //点击按钮显示修改对话框
            async showEditDialog(attr_id){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName} })
                if(res.meta.status!==200){
                    return this.$message.error('获取参数信息失败!');
                }
                this.editForm=res.data

                this.editDialogVisible=true
            },
            //监听修改参数对话框的关闭事件--重置表单
            editDialogClosed(){
                this.$refs.editFormRef.resetFields();
            },
            //点击按钮确定修改参数
            editParamsClick(){
                this.$refs.editFormRef.validate(async valid=>{
                    if(!valid) return
                    const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                    if(res.meta.status!==200){
                        return this.$message.error('修改参数失败!');
                    }
                    this.$message.success('修改参数成功!')
                    this.getParamsData()
                    this.editDialogVisible=false;
                })
            },
            //根据id删除对应的参数项
            async removeParamsClick(attr_id){
                const confirmRes=await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch( err => err)

                if(confirmRes!=='confirm'){
                    return this.$message.info('已取消删除!');
                }
                const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
                if(res.meta.status!==200){
                    return this.$message.error('删除参数失败!');
                }
                this.$message.success('删除参数成功!')
                this.getParamsData()
            },
            //文本框失去焦点或者按下enter键都会触发
            async handleInputConfirm(row){
                if(row.inputValue.trim().length===0){
                    row.inputValue='';
                    row.inputVisible=false;
                    return;
                }
               //如果没有return，说明后面输入的内容需要做后续处理
                row.attr_vals.push(row.inputValue.trim());
                row.inputValue=''
                row.inputVisible=false;

                //发起请求，保存操作
                this.saveAttrValues(row);
            },
            //将对attr_vals的操作保存到数据库
            async saveAttrValues(row){
                //发起请求，保存操作
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' ')
                });

                if(res.meta.status!==200){
                    return this.$message.error('修改参数失败！');
                }
                this.$message.success('修改参数成功！');
            },
            //点击按钮，展示文本输入框
            showInput(row){
                row.inputVisible=true;
                //$nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
                //让文本框自动获得焦点
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            //删除对应参数可选项
            handleClosed(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrValues(row);
            }

        },
        computed:{
            //如果按钮需要被禁用，返回true,否则返回false
            isBtnDisabled(){
                if(this.selectedCateKeys.length!==3){
                    return true
                } else{
                    return false
                }
            },
            //当前选中的三级分类的id
            cateId(){
                if(this.selectedCateKeys.length===3){
                    return this.selectedCateKeys[2]
                }
                return null
            },
            //动态计算标题的文本
            titleText(){
                if(this.activeName==='many'){
                    return '动态参数'
                }else{
                    return '静态属性'
                }
            }
        }

    }
</script>

<style scoped>
.cat_opt{
    margin: 15px 0;
}
.el-cascader{
    margin-left: 10px;
}
.el-table{
    margin-top: 10px;
}
    .el-tag{
        margin: 10px;
    }
    .input-new-tag{
        width: 120px;
    }
</style>
